Multi-currency multi-source support and reporting

Summary:
Enable Cash Flow Pro to support true multi-currency data sources and reporting across multiple source systems. The feature should allow customers to work with actual currency-specific source data rather than relying on reporting workarounds that only simulate multi-currency behavior.

Problem Statement:
Currently, customers who need multi-currency reporting across multiple sources do not have true underlying support for it in Cash Flow Pro. Existing approaches can create the appearance of multi-currency reporting, but they do not provide real multi-currency source handling. This limits reporting accuracy, reduces confidence in the data, and makes it difficult for customers like Saab AU to manage cash flow across globally distributed financial sources.

Proposed Solution:
Add true multi-currency source support within Cash Flow Pro so customers can ingest, manage, and report on data from multiple currency-based sources directly.
Ensure exchange rates, source currencies, and reporting currencies are handled consistently and transparently throughout the workflow.
Allow reports to consolidate or compare values across multiple currencies without relying on simulated or misleading reporting behavior.
Provide clear controls for currency selection, conversion logic, and source-level visibility so users understand how reported values are derived.

Benefits:
Improves reporting accuracy for organizations operating across multiple currencies and source systems.
Reduces reliance on manual workarounds or misleading reporting approximations.
Increases trust in cash flow data by providing transparent, true multi-currency handling.
Better supports global customers with complex financial reporting requirements.